Solar water heaters can be used in winter.
Because the operating requirements of solar water heaters are not determined by the outdoor temperature, but by the intensity of outdoor ultraviolet rays. Therefore, whether it is winter or summer, whether it is sunny or cloudy, as long as the outdoor ultraviolet intensity reaches a certain value, the solar water heater can produce hot water normally.
Purchase of a solar water heater:
1 Generally speaking, the thermal performance index linked to the immediate interest of consumers is the average thermal efficiency of the water heater. solar water heater and average heat loss coefficient.
2. Carefully observe the coating on the glass tube in the vacuum tube. This coating is called selective solar absorption coating. It has a uniform color and does not show streaks, peeling or peeling. phénomene of loss, and there are no stones or nodules on the glass. The brackets supporting the inner glass tube are placed correctly and do not come loose.
3. Pay attention to the distance between the vacuum tubes. Generally, the center distance between the two tubes is approximately 70 mm.
4. Pay attention to whether the reflector design of the product can make full use of the heat-absorbing surface of the vacuum tube and whether the vacuum tube can receive light to the greatest extent.
5. Generally speaking, in winter and sunny days, electric heaters should be used, so products with electrical safety design should also be selected.
6. Check the thickness of the insulation layer of the water tank. The thickness of the flat insulation layer should be 45mm as standard, and the overall polyurethane foam insulation is best.